Opponents of the Keystone XL and Dakota Access pipelines hold a rally as they protest US President Donald Trump's executive orders advancing their construction, at Lafayette Park next to the White House in Washington, DC, on January 24, 2017. US President Donald Trump signed executive orders Tuesday reviving the construction of two controversial oil pipelines, but said the projects would be subject to renegotiation. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

The Keystone oil pipeline spilled more than 5,000 barrels of oil on Thursday before workers took it offline, a large spill that comes days before operators hope to secure a key permit for a sister project.
A TransCanada crew shut down the Keystone pipeline at 6 a.m. Thursday morning after detecting an oil leak along the line, the company said in a statement. The leak was detected along a stretch of pipeline about 35 miles south of a pumping station in Marshall County, South Dakota.
TransCanada estimates the pipeline leaked 5,000 barrels of oil, or about 210,000 gallons, before going offline. The company said it shut off the pipeline within 15 minutes of discovering the leak, and it’s working with state regulators and the Pipelines and Hazardous Materials Safety Administration (PHMSA) to assess the situation.
According to PHMSA data gathered by environmental group Greenpeace in August, three pipeline operators have spilled more than …
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